Abstract: The mathematics model used in the past for the traditional clothing structure design was linear equation with one unknown,and two-variable linear equation was seldom adopted.As the complexity of human being′s body,the pass rate of mathematics model is rather low,failing to meet the development needs of intelligence.This paper,through the calculation of stepwise regression by C++,proposes to develop clothing structure math models of the relationships between 6 key parts(neck girth,chest girth,waist girth,hip girth,shoulder width and body height) and other 31 parts.The results of regression model of various parts of different types are compared,so as to find out the relationship between the parts and the rule of influence and provide a technical basis for CAD of intelligent clothing.